Understanding Quality: Uncovering the Relationship between Variables

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SUMMARY

This discussion focuses on determining the quality of a saturated fluid state using entropy and temperature. The formula for quality is established as x = (v - vf) / vfg, where 'v' represents specific volume, 'vf' is the saturated liquid volume, and 'vfg' is the difference between saturated vapor and liquid volumes. Additionally, internal energy can be calculated using the equation u = uf + xufg. The conversation highlights the importance of understanding these relationships in thermodynamics for accurate calculations.

PREREQUISITES
  • Understanding of thermodynamic properties such as entropy and specific volume
  • Familiarity with the concepts of saturated states in fluids
  • Knowledge of equations related to internal energy calculations
  • Basic skills in manipulating algebraic formulas
NEXT STEPS
  • Study the derivation of the quality formula in thermodynamics
  • Learn about the properties of saturated liquids and vapors
  • Explore the calculation of internal energy in thermodynamic systems
  • Review examples of entropy and specific volume calculations in fluid mechanics
USEFUL FOR

Students in engineering disciplines, particularly those studying thermodynamics, as well as professionals involved in fluid mechanics and energy systems analysis.

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untitled-5.jpg

sorry if i posted this in wrong section..
im having problem on where the value in the circle come from,can someone give me an answer or a hint.
TQ
100820091016.jpg
 
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Hi rojak. This should be in the engineering homework section.

Anyway, do you know how to determine quality? They give you entropy and they tell you the final fluid state is saturated. From the information on entropy and temperature, you should be able to determine the quality. They don't show you how to do that in the example.

Once you have quality, you should be able to determine the internal energy. Again, they don't show you how to do that, but perhaps you can figure it out now.
 


thank for the reply ^ ^
my english is not so good,here what i understand. find the quality x=(v-vf)/vfg, then substitute it in u=uf+xufg.
im confuse now.. i only have mass of 1.5kg,how do i find the specific volume?
v=V/m
V=?
 


thanks! i understand now.. s1=s2..
im using s to find the quality x=(s-sf)/sfg
i got the answer now,thank you very much!
 

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